import React, { Component, PureComponent } from 'react'

export default class Son extends PureComponent {
    shouldComponentUpdate() {
        
    }
    render() {
        const { num } = this.props
        console.log('我是子组件render')
        return (
            <div>
                <h3>
                    Son -- { num }
                </h3>
            </div>
        )
    }
}
